Creating Android UI Programmatically

 public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);
     
        lLayout = new LinearLayout(this);
        lLayout.setOrientation(LinearLayout.VERTICAL);
        //-1(LayoutParams.MATCH_PARENT) is fill_parent or match_parent since API level 8
        //-2(LayoutParams.WRAP_CONTENT) is wrap_content
        lLayout.setLayoutParams(new LayoutParams(
LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT));
        tView = new TextView(this);
        tView.setText("Hello, This is a view created programmatically! " +
                  "You CANNOT change me that easily :-)");
        tView.setLayoutParams(new LayoutParams(
LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT));
        lLayout.addView(tView);
        setContentView(lLayout);
       
  }